The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

Central Iceland GPS Network - GRVA-Graenavatn P.S.
Start: 13-Jul-2009
End: 17-Oct-2019
Bennett, Rick, 2009, Central Iceland GPS Network - GRVA-Graenavatn P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5KW5D8H